EP0626560B1 - A device for measuring a transversal section of a longitudinally-laid object translating in a longitudinal direction - Google Patents
A device for measuring a transversal section of a longitudinally-laid object translating in a longitudinal direction Download PDFInfo
- Publication number
- EP0626560B1 EP0626560B1 EP94830248A EP94830248A EP0626560B1 EP 0626560 B1 EP0626560 B1 EP 0626560B1 EP 94830248 A EP94830248 A EP 94830248A EP 94830248 A EP94830248 A EP 94830248A EP 0626560 B1 EP0626560 B1 EP 0626560B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- support elements
- transversal section
- light source
- emitted
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
- G01B11/10—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
- G01B11/105—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving using photoelectric detection means
Definitions
- the invention relates to a device for measuring a transversal section of a longitudinally-laid object able to translate in a longitudinal direction.
- the device is applicable especially in sawmills, where automatic and speedy measurement of lumber size is necessary during their transport to the sawing stations so that they can be sorted into groups of similar size, or so that the saw machinary can be adapted to receive them.
- Devices of this type act in a fixed plane of a generic transversal section, arranged perpendicular to the trunk advancement direction.
- the measuring operation is continually repeated during the trunk movement so that a certain number of transversal measurements are obtained of a same trunk.
- the measurement is taken by exploiting optical phenomena, where the trunk is invested sideways by light beams emitted by a light source and read by light sensor.
- a first of these comprises two equal units arranged perpendicular to each other. Each unit exhibits a group of light sources and sensors to read the luminous radiations emitted by the light sources.
- the body which section is to be measured is located between the light-sensor groups, and constitutes an obstacle for a part of the light beam emitted by the light sources, so that only a part of the light beams can be picked up and read by the sensors.
- the real configuration of the section is approximated to a circle, which diameter is equal to a distance between the two most internal sensors that have sensed the light beam.
- a further drawback is the excessive maintenance needed, especially so as to keep the constituent elements clean, as they are constantly exposed and close to the dirty tree trunks.
- a second device like the above-described first device, provides a light source and an exactly opposite rank of light sensors, which the body to be measured is placed between.
- a lens is situated between the sensors and the object. This lens collects the light rays emitted by the lamp which are not blocked by the body and sends them towards the sensor rank.
- the diameter of a circle can be calculated, which is approximately the diameter of the body (see e.g. DE-A-2 555 975).
- the main disadvantage of this device is that the lens has continually to be focused, due to imprecision and slowness.
- the presence of the lens also causes a greater structural complexity in the device since focusing devices are necessary to focus it, and it has to be frequently cleaned.
- a further drawback is that in order to explore the transversal section edge a second device, equal to the first, is necessary, located perpendicular to the first, so as to be able to strike the two semiperimeters of the transversal section to be measured. This in effect duplicates the problems inherent in to the use of the lens.
- a third solution in the prior art envisages only one light source and one lens.
- the lens is arranged between the light source and the body, broadening the light beam emitted by the source and directed towards the body.
- a light sensor rank is arranged on the opposite side of the body to the lens, a part of which sensor rank (depending on the configuration of the body transversal section) reads the light beam.
- the principal drawback of the device is that a large number of sensors is necessary, leading to prohibitive costs in the construction of the device.
- the main drawback of the above device is that a distributed exploration of the whole section edge cannot be made, especially in two perpendicular directions, as the law concerning sawmills requires in some countries.
- Another known device is shown in document EP 0 442 252 relating to a device for calculating the mass of a possibly moving object, in particular the diameter and the volume of a tree trunk.
- the device is equipped with an optoelectronic measuring device, which comprises emitting diodes and receiving diodes arranged in a measuring plane which is perpendicular to the longitudinal axis of the object, as well as a processing unit and a photelectric relay which is situated in front of a measuring plane.
- the object to be measured is moved along the measuring plane between the emitting and receiving diodes.
- the measuring plane is superiorly delimited by two supports, arranged at 90 degrees, of a measuring port.
- a line of emitting diodes is arranged internally of the two supports, at small constant distances on the lateral surfaces of emitting supports and turned towards the measuring plane.
- Each of these lines of emitting diodes is associated to a receiving diode lying in the measring plane, at a fixed distance from the emitting support and centrally with respect thereto.
- the emitting diodes of the emitting support are activated, starting from the top and moving downwards and one after another with brief time intervals, by the processing unit together with the associated receiving diode.
- the main drawback of this type of device is constituted by the fact that the approximation of the edge of the tree trunk section is still not satisfactorily precise; that is, the resolution with which the edge of the tree trunk is explored is not optimal.
- An essential aim of the present invention is to obviate the above drawbacks by providing a device for measuring transversal sections of a longitudinally-laid body moving in a longitudinal direction, which device can effect a large number of measurements, taking into consideration the real perimeter surface of the section and obtaining a more precise measurement value for the transversal section and, consequently, an improvement in the subsequent sawing operations.
- a further aim of the present invention is to provide a device for measuring the transversal section of a longitudinally-laid body moving in a longitudinal direction, which is simple to maintain, economical thanks to the presence of few expensive elements, and which constituent elements are well protected from dirt.
- the device is arranged in a fixed single plane 6 perpendicular to the advancement direction of a body 5.
- the measuring operation is effected repeatedly during the transit of the body 5, so that a number of sections are measured, the number depending on the speed of translation and the length of the body 5 as well as on the time the device requires in order to effect a measuring operation, which might be, for example, at a rate of three hundred a second.
- the device also satisfies the most severe regulations concerning the measurement of the tree trunks, as it can effect measurements along the longitudinal development of a trunk centimetre by centimetre even when the trunk is advancing fast, for example at three metres a second, as is common in sawmills.
- the real configuration of a transversal section 4 is approximated by means of a flat geometrical figure.
- a number of points P on the edge of the transversal section are read by sensors, in the case of the invention by exploiting optic phenomena.
- first support elements 13 and 14 are arranged on the measuring plane 6 of the transversal section 4 such that their longitudinal axes 11 and 12 intersect.
- each of the elements 13 and 14 is provided with a plurality 15 and 16 of light sources 17 and 18, aligned along the longitudinal axes 11, 12 of the elements 13, 14.
- the light sources 17, 18 each emit a light beam 19 in one direction along the measuring plane, perpendicular to the axes 11 and 12 of the elements 13, 14, and facing the object.
- FIG. 7 schematically denotes a command and processing unit commanding the light sources 17, 18 so that the body 5 is illuminated in proximity of the transversal section 4 to be measured by successive single light beams 19, emitted in said direction by each source 17, 18 according to a sequence corresponding to the alignment of the light sources 17, 18. In this way, there is a period in which the body 5 is not illuminated. Further, the body 5 is lit in two different directions, perpendicular to the axes 11 and 12 and constituted by the sources issuing from elements 13 and 14 lying on the measuring plane 6.
- right angles are formed by the intersecting axes 11 and 12 of the two first elements 13, 14.
- the number of light sources 17, 18 might be four hundred, according to a preferred embodiment of the invention.
- Each of the second elements 23, 24, bears a plurality 25, 26 of light sensors 27, 28.
- the sensors 27, 28 are aligned along their respective axes 21, 22 and pick up the beam 19 emitted respectively by each light source 17, 18, depending on the real configuration of the transversal section 4 to be measured as well as the position of the sensors with respect to the light source 17, 18.
- the resultant flat geometrical shape approximated by the command and processing unit 7 is a circle.
- the points P on the edge are identified as the points of contact on the edge of the transversal section 4 between a zone of shadow and a light zone, obtained by illuminating the body 5 with one light beam 19 emitted in said direction by a light source 17, 18, and by the fact that they belong to the straight line conjoining the light source 15, 16 to the sensor 27, 28 reading the light.
- Figure 1a shows two second support elements 23, 24 each bearing a plurality 25, 26 of sensors 27, 28, the presence of which grants a greater power of resolution to the device of the invention.
- the increase in the number of sensors results in a greater number of points P, identified by means of optical phenomena, which points lead to the identification of a geometrical figure approximating the real peripheral edge of the section 4, so that with more points supplied to the processor the margin of difference between the real configuration and the deduced geometrical figure is much reduced.
- Figure 2 shows a second embodiment of the device according to the invention, wherein the reference numbers denoting parts common to both embodiments remain the same.
- the support elements 23, 24 each bear one sensor only 27, 28.
- the sensor 27, 28 reads light beam 19, emitted by a light source 17, 18, depending on the real configuration of the transversal section 4 as well as on the position of the light beam 19 with respect to the light source 17, 18.
- Vertical longitudinal axes 31, 32 of two third rigid straight support elements 33, 34 lie on the plane 6 on opposite sides with respect to the body 5.
- One 33 of the elements 33, 34 bears a plurality 35 of light sources 37 aligned on a longitudinal side facing the body 5 and emitting emit a light beam 39 in a horizontal direction lying on the measuring plane 6.
- the other element 34 bears, on a longitudinal side facing the body 5, a corresponding plurality 36 of sensors 38 aligned along the longitudinal axis 32 of the element 34.
- the sensors 36 pick up the beam 39 emitted by each light source 37 according to the real configuration of the transversal section 4 as well as to the position of the sensors 36 with respect to the light source 37.
- Each sensor 38 is paired with a corresponding light source 37, due to the fact that both are arranged on a same horizontal direction lying on the measuring plane 6.
- the command and processing unit 7 commands the light sources 37 to illuminate the body 5 in proximity of the transversal section 4, with successive single light beams 39, emitted in a horizontal direction by each light source 37 according to a sequence corresponding to an alignment of the light sources 37. In this way there exists a non-illuminated period between two illuminated periods and the illumination direction of the body 5 is a horizontal direction lying on the measuring plane 6.
- the flat geometrical figure which the command and processing unit 7 approximates as the transversal section 4 is an ellipse, containing at least five points P P' on the edge of the section 4.
- At least four points P are identified due the the fact of their being a point of contact on the edge of the section 4 between a zone of shadow and a light zone, obtained by illuminating the body 5 with only the light beam 19 emitted by one source 17, 18, and due to the fact that said zone belongs to the straight line conjoining the light source 17, 18 with the sensor 27, 28 reading the light.
- the remaining point P' is identified due to its being the point of contact on the edge of the section 4 between a zone of shadow and a light zone, obtained by illuminating the body 5 with only one light beam 39 emitted in a horizontal direction by a light source 37, and as it belongs to the straight horizontal line conjoining the light source 37 with the sensor 38 picking up the light beam.
- the invention thus attains its set aims.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Testing Of Coins (AREA)
- Body Structure For Vehicles (AREA)
Abstract
Description
Claims (6)
- A device for measuring a transversal section (4) of a longitudinally-laid body (5) moving in a longitudinal direction, acting in a fixed measuring plane (6) of a transversal section (4) arranged perpendicular to an advancement direction of the body (5), repeated measurements taking place during an advancement of the body (5) and being calculated so as to derive an approximation of a real configuration of said transversal section (4) by producing a flat geometrical figure; said figure being calculated from a number of points (P) on a peripheral edge of the body (5) identified by striking the transversal section (4) with light beams (19) emitted by a light source (17, 18) and picked up by a sensor (27, 28),
whereinlongitudinal axes (11, 12) of two first rigid and straight support elements (13, 14) lie and intersect on the measuring plane (6), each of which support elements (13, 14) bears on a longitudinal side facing said body (5) a plurality of light sources (17, 18) aligned along the longitudinal axes (11, 12) of the support elements (13, 14) and each light source (17, 18) emitting a light beam (19) in a direction lying on the measuring plane (6) and perpendicular to said axes (11, 12) of the support elements (13, 14),and wherein through a totality of components which are partly mechanical, partly electrical and partly electronic, all of which being physically united and functionally interdependent and materially united in a command and processing unit (7), the light sources (17, 18) are commanded to illuminate the body (5) in proximity of the transversal section (4) to be measured with successive single light beams (19) emitted in said direction by each light source (17, 18) according to a sequence corresponding to an order of alignment of the light sources (17, 18), there being a non-illuminated period between two consecutive illuminations of the body (5) having two different and reciprocal illumination directions perpendicular to the axes (11, 12) of the support elements (13, 14) and lying on the measuring plane,axes (21, 22) of two second support elements (23, 24) lie on the measuring plane (6) of the transversal section (4) and are parallel to the axes (11, 12) of the first support elements (13, 14), said second elements (23, 24) being opposite each to one of the two first support elements (13, 14), characterised in that each of said second support elements (23, 24) bears a plurality of light sensors (27, 28), each of said plurality of sensors (27, 28) being aligned along one of the axes (21, 22) and picking up said light beam (19) emitted from each of said light sources (17, 18), according to a real configuration of the transversal section (4) to be measured as well as to the position of the plurality of sensors (27, 28) with respect to the light sources (17, 18),such that with each sensor (27,28) two points (P) on the periphery of the body (5) are determined, and in that a processor (7) is provided arranged to approximate the real peripheral edge of the transversal section (4) of said body (5) based on those determined points (P). - A device as in claim 1, characterised in that angles formed by the intersecting axes (11, 12) of said two first support elements (13, 14) are right angles.
- A device as in claim 2, characterised in that the plurality of light sources (17, 18) amounts to four hundred in number.
- A device as in claim 2, characterised in that the flat geometric figure representing the transversal section (4) and constituting an approximation performed by the command and processing unit (7) is a circle, obtained by averaging the circles calculated from a plurality of circles deriving from three points (P) of at least four points (P) on the peripheral edge of the body (5), each point (P) being identified by being a point of contact on said peripheral edge of a light beam (19) situated between a zone of shadow and and light zone, obtained by illuminating said body (5) with one only light beam (19) emitted from a light source (17, 18) and each point (P) belongs to a straight line conjoining said light source (15, 16) with said sensor (27, 28) picking up the light beam (19).
- A device as in claim 2, characterised in that it further comprises an auxiliary measuring system (3) acting on the measuring plane and lying on the transversal section (4) of the measuring plane (6) and on opposite sides of the body (5),said auxiliary measuring system (3) including vertical longitudinal axes (31, 32) of two third rigid and straight support elements (33, 34), one of which third supportelements (33, 34) bears on a side facing the body (5) a plurality of light sources (37) aligned along the axis of the element (33) and emitting a light beam (39) in a horizontal direction lying on the measuring plane (6), the other of which third support elements (33, 34) bears on a longitudinal side facing the body (5) a corresponding plurality (36) of light sensors (38), said light sensors (38) of said auxiliary measuring system (3) being aligned along said longitudinal axis (32) of said element (34) and picking up said light beam (39) emitted by each light source (37) of said auxiliary measuring system (3) according to a real configuration of the transversal section (4) as well as of the position of the sensors (38) of said auxiliary measuring system (3) in relation to the light source (37) of said auxiliary measuring system (3), each sensor (38) of said auxiliary measuring system (3) also being paired with a corresponding light source (37) of said auxiliary measuring system (3) by being arranged on a same horizontal direction lying on said measuring plane (6),the command and processing unit commands said light sources (37) of said auxiliary measuring system (3) to illuminate the body (5) in proximity of the transversal section (4), with successive single light beams (39), emitted in a horizontal direction by each light source (37) of said auxiliary measuring system (3), so that between two consecutive illuminations of the body (5) there is a non-illuminated period; an illumination direction of the body (5) being a horizontal direction lying on the measuring plane (6).
- A device as in claim 5 characterised in that the flat geometrical figure approximating a real shape of a transversal section of the body (5) and obtained by the command and processing unit (7) is an ellipse, to which ellipse at least five points (P, P') situated on the peripherhal edge of the body (5) belong, at least four of which points (P, P') being points of contact on the edge of the transversal section (4) between a zone of shadow and a light zone obtained by illuminating the body (5) with one beam (19) emitted by a light source (17, 18) mounted on said first support elements (13, 14) and belonging to a straight line conjoining the light source (17, 18) with the sensor (27, 28) mounted on said second support elements (23, 24) picking up the light, and the remaining point (P') being a point of contact on the peripheral edge of the transversal section (4) between a zone of shadow and a light zone, obtained by illuminating the body (5) with a single light beam (39) emitted in a horizontal direction by the light source (37) of said auxiliary measuring system (3) and belonging to a same straight line conjoining the light source (37) with the sensor (38) of said auxiliary measuring system (3) picking up the light.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBZ930025A IT1270522B (en) | 1993-05-26 | 1993-05-26 | DEVICE FOR THE MEASUREMENT OF THE CROSS SECTION OF A LONGITUDINALLY EXTENDED OBJECT AND EQUIPPED WITH LONGITUDINAL MOVEMENT OF TRANSLATION |
ITBZ930025 | 1993-05-26 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0626560A2 EP0626560A2 (en) | 1994-11-30 |
EP0626560A3 EP0626560A3 (en) | 1995-12-13 |
EP0626560B1 true EP0626560B1 (en) | 1998-12-23 |
Family
ID=11346600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94830248A Expired - Lifetime EP0626560B1 (en) | 1993-05-26 | 1994-05-24 | A device for measuring a transversal section of a longitudinally-laid object translating in a longitudinal direction |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0626560B1 (en) |
AT (1) | ATE175021T1 (en) |
DE (1) | DE69415392T2 (en) |
IT (1) | IT1270522B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE505671C2 (en) * | 1995-12-06 | 1997-09-29 | Svenska Elektronikprodukter Ab | Method and apparatus for measuring diameters of elongated objects |
SE0401049L (en) * | 2004-04-29 | 2005-07-26 | Mindproxy Ab | Method and device for measuring the extent of an object |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT351282B (en) * | 1975-10-30 | 1979-07-10 | Kletzmaier Karl | DEVICE FOR DETERMINING OR MONITORING THE DIMENSIONS OF ANY MOVING OBJECT |
DE3633275A1 (en) * | 1986-09-30 | 1987-10-08 | Siemens Ag | METHOD FOR GENERATING POSITION SIGNALS REPRESENTING LOCATIONS THAT LIMIT THE ELLIPTIC CROSS-SECTIONAL SURFACE OF AN OBJECT |
AT393907B (en) * | 1990-02-16 | 1992-01-10 | Sprecher Energie Oesterreich | DEVICE FOR DETECTING THE DIMENSIONS OF AN OBJECT MOVING OBJECT |
AT403738B (en) * | 1991-06-24 | 1998-05-25 | Keba Gmbh & Co | MEASURING DEVICE FOR LONG STRETCHED ITEMS, IN PARTICULAR WOOD TRUNKS |
-
1993
- 1993-05-26 IT ITBZ930025A patent/IT1270522B/en active IP Right Grant
-
1994
- 1994-05-24 AT AT94830248T patent/ATE175021T1/en not_active IP Right Cessation
- 1994-05-24 DE DE69415392T patent/DE69415392T2/en not_active Expired - Fee Related
- 1994-05-24 EP EP94830248A patent/EP0626560B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITBZ930025A0 (en) | 1993-05-26 |
ATE175021T1 (en) | 1999-01-15 |
IT1270522B (en) | 1997-05-06 |
ITBZ930025A1 (en) | 1994-11-26 |
DE69415392D1 (en) | 1999-02-04 |
DE69415392T2 (en) | 1999-07-01 |
EP0626560A3 (en) | 1995-12-13 |
EP0626560A2 (en) | 1994-11-30 |
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